Grouped frequency table

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In order to access this I need to be confident with:

Tally chart Decimals Collecting data Inequalities Mean, median and mode Range

This topic is relevant for:

GCSE Maths Statistics Frequency Tables

Grouped Frequency Table

Here we will learn about grouped frequency tables, including what grouped frequency tables are and how to make them.

There are also frequency table worksheets based on Edexcel, AQA and OCR exam questions, along with further guidance on where to go next if you’re still stuck.

What is a grouped frequency table?

A grouped frequency table (grouped frequency distribution) is a way of organising a large set of data into more manageable groups.

The groups that we organise the numerical data into are called class intervals. They can have the same or different class widths and must not overlap.

To make a grouped frequency table we have three columns:

The first column is for the groups where we write the class intervals.
The middle column is for the tally marks.
The last column is the frequency column where we can add up the tally marks.

We can add up all of the frequencies to find the total frequency of the set of data.

E.g.

Here are the number of marks scored by $20$ students in a test.

6	9	11	14	19
7	4	8	12	15
3	9	11	10	18
7	9	12	13	17

They can be organised into a grouped frequency table like this:

Organising the grouped data will help us to draw graphs and analyse it.

We can use grouped frequency tables to find different averages.

Step-by-step guide: Averages from frequency tables

What is a grouped frequency table?

How to make a grouped frequency table

In order to make a grouped frequency table:

Go along the set of data and mark off each item with a tally mark in the table.
Fill in the frequency column.
Find the total frequency.

How to make a grouped frequency table

Grouped frequency table worksheet

Get your free grouped frequency table worksheet of 20+ questions and answers. Includes reasoning and applied questions.

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Grouped frequency table worksheet

Get your free grouped frequency table worksheet of 20+ questions and answers. Includes reasoning and applied questions.

DOWNLOAD FREE

Related lessons on frequency tables

Grouped frequency table is part of our series of lessons to support revision on frequency tables. You may find it helpful to start with the main frequency table lesson for a summary of what to expect, or use the step by step guides below for further detail on individual topics. Other lessons in this series include:

Grouped frequency table examples

Example 1: whole numbers

Sort these $20$ items into the grouped frequency table.

5	9	11	17	12
6	4	8	9	27
2	12	31	35	16
13	10	2	32	29

Go along the set of data and mark off each item with a tally mark in the table.

2Fill in the frequency column.

Add up the tally marks and fill in the frequency column.

3Find the total frequency.

Add the frequencies in the frequency column to find the total frequency.

Example 2: whole numbers

Sort these $25$ items into the grouped frequency table.

4	7	10	13	20
21	12	4	2	12
16	17	19	23	21
22	24	15	20	19
8	6	11	17	21

Go along the set of data and mark off each item with a tally mark in the table.

Fill in the frequency column.

Add up the tally marks and fill in the frequency column.

Find the total frequency.

Add the frequencies in the frequency column to find the total frequency.

Example 3: whole numbers

Sort these $25$ items into the grouped frequency table.

10	43	25	34	31
9	25	30	28	12
26	19	11	8	35
41	28	19	8	21
20	47	32	28	21

Go along the set of data and mark off each item with a tally mark in the table.

Be careful to check the inequality signs to see which numbers are included in the interval.

E.g.

The item $‘10’$ would be in the first group as the class interval includes $10$ .

Fill in the frequency column.

Add up the tally marks and fill in the frequency column.

Find the total frequency.

Add the frequencies in the frequency column to find the total frequency.

Example 4: decimals

Sort these $15$ items into the grouped frequency table.

5.7	9.6	12.5	16.3	12.1
5.4	4.9	8.7	9.0	21.2
24.5	6.6	34.3	36.7	16.2

Go along the set of data and mark off each item with a tally mark in the table.

Be careful to check the inequality signs to see which numbers are included in the interval.

Fill in the frequency column.

Add up the tally marks and fill in the frequency column.

Find the total frequency.

Add the frequencies in the frequency column to find the total frequency.

Example 5: decimals

Sort these $15$ items into the grouped frequency table.

19.2	23.4	12.6	23.1	19.9
17.3	20.5	14.1	21.8	13.0
6.3	7.9	20.5	23.6	19.0

Go along the set of data and mark off each item with a tally mark in the table.

Be careful to check the inequality signs to see which numbers are included in the interval.

Fill in the frequency column.

Add up the tally marks and fill in the frequency column.

Find the total frequency.

Add the frequencies in the frequency column to find the total frequency.

Example 6: decimals

Sort these $20$ items into the grouped frequency table.

10.6	26.8	42.9	59.8	17.5
21.5	29.8	8.7	13.2	29.1
13.2	8.0	51.3	47.9	41.3
33.4	24.6	19.2	28.3	3.6

Go along the set of data and mark off each item with a tally mark in the table.

Be careful to check the inequality signs to see which numbers are included in the interval.

Fill in the frequency column.

Add up the tally marks and fill in the frequency column.

Find the total frequency.

Add the frequencies in the frequency column to find the total frequency.

How to design a grouped frequency table

In order to design a grouped frequency table:

Go along the set of data to find the lowest value and the highest value.
Split the range of values into about $4$ to $6$ class intervals with equal width.
Complete the grouped frequency table.

Designing a grouped frequency table examples

Example 7: designing a grouped frequency table

Sort these $20$ items into the grouped frequency table.

Go along the set of data to find the lowest value and the highest value.

The lowest value is $7$ and the highest value is $50$ .

Spilt the range of values into about $4$ to $6$ class intervals with equal widths.

The values are from $7$ to $50$ .

We could do class intervals of $1$ to $10, 11$ to $20$ and so on up to $50$ . There will be $5$ groups, which is sensible.

Complete the grouped frequency table.

Example 8: designing a grouped frequency table

Sort these $20$ items into the grouped frequency table.

Go along the set of data to find the lowest value and the highest value.

The lowest value is $12$ and the highest value is $97$ .

Spilt the range of values into about $4$ to $6$ class intervals with equal widths.

The values are from $12$ to $97$ .

We could do class intervals of $1$ to $20, 21$ to $40$ and so on up to $100$ . There will be $5$ groups, which is sensible.

Complete the grouped frequency table.

Common misconceptions

Tally marks

Each tally mark represents one item.
We can group the tally marks into $5$ s.

Classes for grouped frequency tables can be written in different ways

The class intervals used in grouped frequency tables can be written in different ways. Take care with inequalities that the item goes in the correct group.

E.g.

$0$ to $5$

0-5

0\le x<5

0<x \le5

Deciding your own groups

If you are asked to decide your own group it is sensible to have between about $4$ and $6$ different classes. The class intervals should also have equal widths. Going up in $5$ s, or $10$ s or $20$ s is also sensible.

Practice grouped frequency table questions

Checking the first group, there are $3$ numbers in the $0$ to $9$ class. Checking the second group, there are $5$ numbers in the $10$ to $19$ class. And finally there are $7$ numbers in the $20$ to $29$ class.

Checking the first group, there are $4$ numbers in the $0-4$ class. Checking the second group, there are $5$ numbers in the $5-9$ class. And finally there are $7$ numbers in the $10-14$ class.

Checking the first group, there are $3$ numbers in the $0 \le x<10$ class. Checking the second group, there are $6$ numbers in the $10\le x<20$ class. And finally there are $6$ numbers in the $20\le x<30$ class.

Checking the first group, there are $5$ numbers in the $0\le x<10$ class. Checking the second group, there are $7$ numbers in the $10\le x<20$ class. Finally there are $3$ numbers in the $20\le x<30$ class.

Checking the first group, there are $4$ numbers in the $0\le x<5$ class. Checking the second group, there are $5$ numbers in the $5\le x<10$ class. And finally there are $6$ numbers in the $10\le x<15$ class.

Checking the first group, there are $3$ numbers in the $0\le x<20$ class. Checking the second group, there are $8$ numbers in the $20\le x<40$ class. And finally there are $4$ numbers in the $40\le x<60$ class.

It is sensible to have $4$ to $6$ different class intervals. $2$ groups is too few, and $8$ groups is possibly too many for $20$ values. It is also best if the widths of the classes are the same.

Grouped frequency table GCSE questions

1. Akira has carried out a survey to find the number of text messages sent by $20$ of her friends last week.
Here are the results.

15	7	19	42	48
17	9	23	13	27
19	29	32	38	18
40	25	35	32	31

Complete the grouped frequency table:

(2 marks)

Show answer

For at least one correct tally or frequency

(1)

For all frequencies correct

(1)

2. Oliver asked $20$ people how long in minutes they spent doing their science homework.

Here are his results.

17	20	28	35	46
10	26	39	48	52
19	23	39	38	41
38	27	32	40	15

Complete the grouped frequency table:

(2 marks)

Show answer

For at least one correct tally or frequency

(1)

For all frequencies correct

(1)

3. Ade is surveying the heights of $20$ sunflower plants.
He measures them to the nearest centimetre.

Here are the results in metres

1.25	1.31	1.45	1.07	1.68
1.35	1.26	1.19	1.70	1.79
1.82	1.54	1.57	1.61	1.59
1.89	1.71	1.83	1.62	1.43

Complete the grouped frequency table:

(2 marks)

Show answer

For at least one correct tally or frequency

(1)

For all frequencies correct

(1)

Learning checklist

You have now learned how to:

Complete a grouped frequency table, including integers and decimals

The next lessons are

Still stuck?

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